Plate clamp



June 18, 1929.

F. LAMATSCH PLATE CLAMP Filed Sept. '7, 1927 Patented June 18, 1929.

UNITED STATES 1,717,391 PATENT OFFICE.

FREDERICK LAMATSCH, 0F GRANTWOOD, NEW JERSEY, ASSIGNOR TO B. HOE & 00.,

INQ, OF NEW YORK, N. Y., A. CORPORATION OF NEW YORK.

PLATE CLAMP.

Application filed September 7, 1927. Serial No. 21"?,8'97.

This invention relates to certain improvements in plate clamps, especially in clamps employed in clamping plates on the cylinders of printing presses.

These plate clamps as commonly constructed include a block which has a sliding movement to locking and unlocking position in av block and also on the walls of the recesses in which they move, and this wear results in an undesirable looseness in the parts. This makes it necessary to recut the grooves and to use new clips having thicker projections, which is expensive and takes up an undesirable amount of time.

It is the especial object of the invention to provide a liner or gib which is interposed be tween the-block and the walls of the slots which is of a metal softer than the walls of the slots, so that this wears more rapidly than the metal of the slot walls, and thus reduces to alargelextent the wear in the slots.

It is'a further object of the invention to produce a liner or gib which is readily removable and replaceable, so that no unnecessary time is lost removing a worn liner and replacing a new one.

lVith these and other objects not specifically referred to in view, the invention consists in certain novel parts, arrangements and combinations which will be described in connection with the accompanying drawings and pointed out in the claims the novel features hereunto annexed.

In these drawings Figure 1 is an end view partly broken away and partly in section ot a plate cylinder showing a plate clamp and the liners in place Figure 2 is a longitudinal sectional View of the cylinder of Fig. 1 looking in the direction of a row 2, the view being taken on the line AA of Fig. 1, and

Figure 3 is a view of the improved liner or gib in its preferred form. I

Referring now to these drawings, so much of a plate cylinder has been illustrated asis necessary for an understanding of the invention, this cylinder being of the usual steel conare locked in position on the cylinders by plate clamps, two forms of which are shown. These clamps comprise blocks 8, 4 which have plate engaging surfaces. The outside block 3 has one plate engaging surface or clip 5, bevelled to engage the outer bevelled edge of the plate P, and the inside block 4 has plate engaging surfaces 6, 7 to engage the bevelled inner edge of plate P and bevelled outer edge of inner platejl These blocks have a sliding movement in the cylinder wall .to lock up and release the plates, a longitudinal groove 8 being cut in the cylinder to receive the clamps. According to the invention an improved liner or gib is provided for preventing wear in the groove due to the movement of the blocks, so

as to obviate the necessity of recutting the .parts. In the particular construction shown the walls of the groove 8 are formed with opposed slots or recesses 9, 10, in which projections 11, 12 on the block have a sliding engagement. Interposed between the walls of the'slots and the projections where the wear takes place are arranged the improved liners. I \Vhile the specific construction of these may vary, in the best .form they will be of a material which will wear more readily than the walls of the slots. In the best constructions, moreover, the liners will be so formed that they may be readily put into place and removed. As shown, where the cylinder is of steel the liners will be of brass or some other metal which will wear more readily than the steel, and are in the form of strips 13 having turned over or hooked ends 14, 15 which may be sprung over the projections on the clamp blocks. These strips are suiticiently wide to provide the required bearing surface, and two strips are provided for each clamp block in the particular construction shown. These liners when worn out may be quickly and easily removed and by preventing wear in the cylinder save time and expense.

The clamp blocks may be operated in any usual or desired manner and a conventional way is shown in which there is provided an actuator rod 16 threaded through the block 3 and operated from outside the cylinder by plate clamp sliding in the groove, and a liner of material softer than that of the cylinder interposed between the clamp and the walls of the groove and moving with the clamp.

2. In a plate clamp, the combination of a cylinder provided'with a groove or slot, a plate clamp sliding in the groove, and a liner fitting over the ends of the clamp and interposed bctweenthe clamp and the walls of the groove.

3. In a plate clamp, the combination of a cylinder provided with a groove or slot, a plate clamp sliding in the groove, and a re- .movable liner sprung over the ends of the clamp and interposed between the clamp and the walls of the groove.

4. Ina plate clamp, the combination of a cylinder provided with a groove or slot, the side walls of which are provided with recesses, a plate clamp having projections sliding in t 1e recesses. and removable liners hooked over the ends of the projections and interposed between the projections and the walls of the groove.

In testimony whereof I have hereunto'set my hand.

FREDERICK LAMATSCH. 

